import java.util.Scanner;
public class BC30 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();//8
        int h = in.nextInt();//5
        int m = in.nextInt();//16
        int count;
        if(m <= n*h){
            if(m%h != 0)
                count = n - (m/h+1);//8-(16/5+1)
            else
                count = n - m/h;//8-(16/5)
        System.out.println(count);
        }
    }
}